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''Droseridites'' is a genus of extinct plants of possible droseracean or nepenthacean affinity. It is a form taxon known only from fossil pollen. Species assigned to this genus originate from numerous regions of the world, including Europe (from France to the Caucasus),〔Krutzsch, W. 1985. Über ''Nepenthes''-Pollen im europäischen Tertiär. ''Gleditschia'' 13: 89–93.〕 India,〔Saxena, R.K. & G.K. Trivedi 2006. Birbal Sahni Institute of Palaeobotany, Lucknow.〕 Egypt,〔Ibrahim, M.I.A. 1996. Aptian-Turonian palynology of the Ghazalat-1 Well (GTX-1), Qattara Depression, Egypt. ''Review of Palaeobotany and Palynology'' 94(1–2): 137–168. 〕 the Arabian Peninsula,〔 and the Kerguelen Islands.〔Meimberg, H., A. Wistuba, P. Dittrich & G. Heubl 2001. Molecular phylogeny of Nepenthaceae based on cladistic analysis of plastid trnK intron sequence data. ''Plant Biology (Stuttgart)'' 3(2): 164–175. 〕 This genus is characterised by inaperturate and spinose pollen grains that are united in loose tetrahedral tetrads (groups of four). The grains are prolate, striate, and tricolpate. The colpi are slender and long, whereas the striae are very fine, densely packed, and situated parallel to the polar axis.〔Baksi, S.K. & U. Deb 1976. On ''Mulleripollis'' gen. nov., a pollen tetrad from the Upper Cretaceous of the Bengal Basin, West Bengal, India. ''Review of Palaeobotany and Palynology'' 22(1): 73–77. 〕 ==Species== ''Droseridites spinosus'', the type species, has been recorded from the Tertiary of the Kerguelen Islands〔Ehrendorfer, F. 1989. (''Woody Plants—Evolution and Distribution Since the Tertiary ). Springer-Verlag, Vienna.〕 and the Miocene of India, including the Warkalli Formation (Bharathi and Kundra Clay Mines, Kerala) and the Sindhudurg Formation (Mavli Mine at Redi, Sindhudurg District, Maharashtra).〔 It is of possible nepenthacean affinity.〔 Specimens identified in the literature as ''D.'' cf. ''spinosus'' have also been reported from Hungarian Miocene deposits.〔 ''Droseridites baculatus'' was described from the Ghazalat-1 Well, Qattara Depression, Egypt.〔 ''Droseridites echinosporus'' has been recorded from European Tertiary strata and is a member of a group of similar species that have been interpreted as belonging to the genus ''Nepenthes''.〔 Sites for ''D. major'', a possible nepenthacean species,〔 include the Tertiary of Europe〔 and the Palaeocene-early Eocene Rekmangiri Coalfield of Garo Hills, Meghalaya, India.〔 ''Droseridites parvus'' was originally described from the lower Eocene Cherry Formation of Assam, India.〔 It has also been recorded from the Palaeocene Tura Formation of the "''Retialetes emendatus'' zone" in Assam〔 and the Oligocene-Neogene Dharmsala and Siwalik (Dharmsala and Nurpur areas, Kangra District, Himachal Pradesh).〔 The species is characterised by wart-like sculpturing and is "presently impossible to interpret".〔 Pollen matching the description of ''D. senonicus'' has been found in formations of the Arabian Peninsula dating to as early as the Middle Cretaceous to late Upper Cretaceous, and it has been suggested that this species may represent an early palm taxon.〔 Unidentified ''Droseridites'' palynomorphs have been recorded from numerous sites in India, including the Miocene Cuddalore Formation (Neyveli Lignitefield, Tamil Nadu), the Palaeocene Tura Formation (Langrin Coalfield, Khasi Hills, Meghalaya), the Palaeocene Seam No. 1 (Rekmangiri Coalfield, Garo Hills, Meghalaya), and the Oligocene-Neogene Dharmsala and Siwalik.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Droseridites」の詳細全文を読む スポンサード リンク
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